diff --git a/cmake/EthCompilerSettings.cmake b/cmake/EthCompilerSettings.cmake
index 1f7600d9b..3bcdad47b 100644
--- a/cmake/EthCompilerSettings.cmake
+++ b/cmake/EthCompilerSettings.cmake
@@ -50,6 +50,7 @@ if (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MA
 	add_compile_options(-pedantic)
 	add_compile_options(-Wno-unknown-pragmas)
 	add_compile_options(-Wimplicit-fallthrough)
+	add_compile_options(-Wsign-conversion)
 
 	# Configuration-specific compiler settings.
 	set(CMAKE_CXX_FLAGS_DEBUG          "-O0 -g3 -DETH_DEBUG")